Cesium-134/137 amount in the atmosphere have not been changed since September of 2011

According to CTBT, Comprehensive Nuclear-Test-Ban Treaty’s radiation monitoring post in Takasaki Gunma, the amount of cesium-134/137 in the atmosphere have almost not been changed since September of 2011.

Last December, 64 μBq/m3 of Cs-134 and 107 μBq/m3 of Cs-137 were measured at average.

Cesium-134/137 amount in the atmosphere have not been changed since September of 2011


Related article..65 μSv/h on the snow in Fukushima [URL]








Français :

La quantité en césiums 134/137 atmosphériques n’a pas changé depuis septembre 2011

Selon le CTBT, la borne de surveillance de la radioactivité du Comprehensive Nuclear-Test-Ban Treaty à Takasaki, préfecture de Gunma, la quantité de césium 134/137 atmosphérique n’a pratiquement pas changé depuis septembre 2011.

En décembre dernier on relevait 64 μBq/m³ de Cs-134 et 107 μBq/m³ de Cs-137 en moyenne.

La quantité en césiums 134/137 atmosphériques n'a pas changé depuis septembre 2011

Article lié : 65 μSv/h dans la neige de Fukushima [Lien]




    1. Cui bono ?

      The rad graph shows that the beneficiary from the Fukushima emissions which are setting the background higher is good for the world-wide nuclear power industry to hide its foot-print and blame Fukushima .

      I mean , what scientist would scream ” wait a minute , but some radiation is not from Fukushima ! ” …

      But far-out in the back of my annoying Cerebral Cortex lurks the example of the lady-bug that defends by tasting awful just as a radioactive Earth is unappealing to extraterestrial aliens … your turn Mr. Heineken .

  1. One of the things the graph shows , besides that the producing of radiation is steady 24/7 , is how much and how fast the peak of the radiation on 3/11 was dispersed Out of atmosphere … hence it proves that without present continious production of radiation 24/7 the atmospheric levels would go even lower .

    What the graph doesn’t show is the Origin of the radiation we see being steady after the drop past 2011 .

    What’s the natural level ? Dig a rock 50 meters from below , measure the rad , and than point away from Earth while in the space shuttle , add the two .

  2. Hi all.

    Half-life of Cs-137 is 30 years, half-life of Cs-134 is more than 2 years. The scale on Y-axis of the chart is logarithmic: 1.E+02 is 10 times more than 1.E+01. That’s why it seems not dropping. Correct me if I’m wrong, please.

  3. There does appear to be a steady state of radiation in the atmosphere, the thing that screams to me, is the fact that I-131 has considerably shorter half-life that Cs-137 and Cs-134 ( I-131 only 8 days), meaning theres still a supply of I-131 to the atmosphere, ( which accounts for about 3% by mass of the fission occuring, so fission is still occurring and being released for us to breathe) I have read on Fukushima Diary about the daily release of radiation from Fukushima, so this kinda put the jigsaw together a little.

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About this site

This website updates the latest news about the Fukushima nuclear plant and also archives the past news from 2011. Because it's always updated and added live, articles, categories and the tags are not necessarily fitted in the latest format.
I am the writer of this website. About page remains in 2014. This is because my memory about 311 was clearer than now, 2023, and I think it can have a historical value. Now I'm living in Romania with 3 cats as an independent data scientist.
Actually, nothing has progressed in the plant since 2011. We still don't even know what is going on inside. They must keep cooling the crippled reactors by water, but additionally groundwater keeps flowing into the reactor buildings from the broken parts. This is why highly contaminated water is always produced more than it can circulate. Tepco is planning to officially discharge this water to the Pacific but Tritium is still remaining in it. They dilute this with seawater so that it is legally safe, but scientifically the same amount of radioactive tritium is contained. They say it is safe to discharge, but none of them have drunk it.


January 2013